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near-infrared radiation |
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near-infrared radiation [′nir ‚in·frə′red ‚rād·ē′ā·shən] (electromagnetism) Infrared radiation having a relatively short wavelength, between 0.75 and about 2.5 micrometers (some scientists place the upper limit from 1.5 to 3 micrometers), at which radiation can be detected by photoelectric cells, and which corresponds in frequency range to the lower electronic energy levels of molecules and semiconductors. Also known as photoelectric infrared radiation. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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The first glimmers came from observations of radio waves and X rays, which easily pass through dust, and studies of near-infrared radiation, which can penetrate dust 10 times better than visible-light can. However, intensive use of glass can cause harsh lighting effects and lead to interior heat buildup from penetration of near-infrared radiation, especially in hot and/or sunny locales. Because of its large size, the camera can detect near-infrared radiation from a given region of the sky more than 50 times faster than the detector that McMahon and Hu used at Keck I. |
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